. >>> vice president biden says the country cannot remain silent after last month's school shooting. the vice president said the 2007 virginia tech massacre shows how important background checks are to keep guns out of the wrong hands. >>> president obama and secretary of state hillary clinton are parting ways. clinton is leaving her job at the state department next week. they sat down together for an interview with "60 minutes." and we'll have some of that for you in 30 minutes. >>> for much of the country this morning, it is cold. the national weather service is warning of bitterly cold conditions. this weekend across much of the northeast, the mid-atlantic, and the midwest, several inches of snow fell yesterday on parts of the ohio valley, then pushed through to the east coast. the system brought an arctic blast that forecasters say could be deadly. warming centers are open now in pennsylvania, new york, and new jersey. some superstorm sandy victims there still, believe it or not, don't have basic utilities to keep warm. and the tennessee valley and the carolinas are also on ice.